jsancio commented on code in PR #18852:
URL: https://github.com/apache/kafka/pull/18852#discussion_r1964102208


##########
core/src/test/scala/unit/kafka/cluster/PartitionTest.scala:
##########
@@ -480,22 +481,36 @@ class PartitionTest extends AbstractPartitionTest {
     }
 
     partition.createLogIfNotExists(isNew = true, isFutureReplica = false, 
offsetCheckpoints, None)
+    var partitionState = new LeaderAndIsrRequest.PartitionState()
+      .setControllerEpoch(0)
+      .setLeader(2)
+      .setLeaderEpoch(prevLeaderEpoch)
+      .setIsr(List[Integer](0, 1, 2, brokerId).asJava)
+      .setPartitionEpoch(1)
+      .setReplicas(List[Integer](0, 1, 2, brokerId).asJava)
+      .setIsNew(false)
+    assertTrue(partition.makeFollower(partitionState, offsetCheckpoints, None))
 
     val appendThread = new Thread {
       override def run(): Unit = {
-        val records = createRecords(List(new SimpleRecord("k1".getBytes, 
"v1".getBytes),
-          new SimpleRecord("k2".getBytes, "v2".getBytes)),
-          baseOffset = 0)
-        partition.appendRecordsToFollowerOrFutureReplica(records, isFuture = 
false)
+        val records = createRecords(
+          List(
+            new SimpleRecord("k1".getBytes, "v1".getBytes),
+            new SimpleRecord("k2".getBytes, "v2".getBytes)
+          ),
+          baseOffset = 0,
+          partitionLeaderEpoch = prevLeaderEpoch
+        )
+        partition.appendRecordsToFollowerOrFutureReplica(records, isFuture = 
false, prevLeaderEpoch)
       }
     }
     appendThread.start()
     TestUtils.waitUntilTrue(() => appendSemaphore.hasQueuedThreads, "follower 
log append is not called.")
 
-    val partitionState = new LeaderAndIsrRequest.PartitionState()
+    partitionState = new LeaderAndIsrRequest.PartitionState()
       .setControllerEpoch(0)
       .setLeader(2)
-      .setLeaderEpoch(1)
+      .setLeaderEpoch(prevLeaderEpoch + 1)

Review Comment:
   Yes, good catch. Fixed it.



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